I have a pair of rudy project ketyum's, won't trade it for anything in the world, comes with gray and clear lenses, all I need. They have a 3 year warranty on it. Replacement lenses are $15 if you break yours and they have several online retailers where u buy other lenses from.
Rudy's are also much more adjustable plus the spring hinges are great if I want to wear the glasses over my helmet straps or under they adjust great, venting is great.

I actually looked at several pairs and if you can get your hands on a pair of ketyum's, the build quality'll blow everything shy of the $300 oakley's away. I don't know if it's coincidence or what but whoever made my ketyum's aligned every single flathead screw in it the same direction, vertically. Now that's quality.

BTW: specialized is coming out with their own line of sunglasses. since they're one of the top makers of bikes, tires, and accessories, it stands to assume they know what they're doing. the lenses are going to be photochromatic, meaning they change in darkness depending on how bright it is outside.